When buying "O" rings, there is no need to go to an authorized Jabiru agent. By sourcing from directly from other suppliers, you could save a fortune. OEM part numbers for "O" rings can be found in the Jabiru parts manualwhich can be found in the JabiruOwnersGroup documentation area. Here is an example of how to save yourself a pound or two (extract from manual) ...

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There is a Jabiru part number in red and an OEM part number highlighted. From google, search for the OEM part number BS114V ...